That would make it a Power FC
Pro to suit GC8D/E 09/96-08/98.
Pro has launch control i.e Its not a true launch control. What it does is offer a 2 stage rev limit, one which is static and the other one is absolute.
So if you set the static one at 2500rpm, as long as the
ECU is reading 0 kph then it will limit the revs to the set level, and as the FC pro cuts the ignition and not the fuel as a by product you get lots of bangs and pops as the fuel ignites (quazzie anti lag)
It does mean you can have full throttle launches at full boost, but is doesn't pull ignition timing like 'proper' anti lag
Rpm limiters are also ignition cut on the pro V fuel cut on all other wrx power fc's.
Power FC Pro's are UBER rare for Wrx's.
If you can find the Apex part number (414-????) for it I can find some more info for you.